brains vs powers of thought

brains

noun

  • The substance of a brain, as a material or foodstuff. 

  • The figurative substance of a brain: mental ability, intelligence. 

  • The intelligent person or people in a group: the director, planner, administrator, etc. 

powers of thought

How often have the words brains and powers of thought occurred in a corpus of books? (source: Google Ngram Viewer )